Ear plug



FIG. 1 is a front perspective view of an ear plug, showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a side elevational view thereof;

FIG. 4 is a bottom plan view thereof; and,

FIG. 5 is a cross-sectional view thereof, taken along the 5—5 line of FIG. 2, whereas the dashed lines are for environmental purposes only and form no part of the claimed design. 

The ornamental design for an ear plug, as shown and described. 